On 17.2.2010, at 16.05, Werner wrote:
Feb 16 17:33:46 cmx2 postfix/pipe[24221]: DD3F118A22A: to=<werner@example.com>, relay=dovecot, delay=3.4, delays=0.75/0/0/2.6, dsn=4.3.0, status=deferred (temporary failure. Command output: Internal error occurred. Refer to server log for more information. [2010-02-16 17:33:43])
That looks like exactly the kind of error I was talking about. Looking at Dovecot's log would show what the internal error was.
sadly, I did not find any more specific hints in the Maillog (mail_debug=yes) than this line :-(
It really should have logged something. http://wiki.dovecot.org/LDA#logging and/or http://wiki.dovecot.org/Logging may give hints.
So, I assume it could work to have to servers for incoming SMTP active, even if dovecot-deliver is used as LDA?
Well, it's not error free, as you said you got 5 errors already. But if you can live with random errors, sure..